What is the similarities between X-rays and visible light?

Answer 1

Both beams seem to have wave/particle duality.

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If we consider in a simple way the think, a focus electron beam behave somehow like a light beam even if it is a particle beam. Thus diffraction figures can be observed on a screen if the electron beam passes through a very small gap.

The great difference is that the equivalent wavelength of the electron beam seems to be very small with respect to light beam. The observed wavelength of an electron beam depends on electrons energy, being in general of the order of 1 nm (one meter part out of one billion) while green light has a wavelength of the order of 540 nm.

If we look more in deep the phenomenon, in quantum mechanics both a light beam and an electron beam are particle beams, being photons the light particles. They are in any case particle that do not resemble small rigid balls, but having quite exotic properties, like generating interference and, in case of photons, to be at light speed in any possible situation.

The basic difference is that electrons are fermions, with spin equal to 0.5 and a finite rest mass, while photons are bosons, with zero spin and zero rest mass. This difference causes the macroscopic difference in their behaviours.

Answer 2

They are both light waves, just different wave lengths. X-rays have very small wave length and very high energy compared to visible light.

Answer 3

Both have a wavelength.

Both have a frequency.